Homochiral Ferromagnetic Coupling Dy2 Single-Molecule Magnets with Strong Magneto-Optical Faraday Effects at Room Temperature

2021 ◽  
Author(s):  
Cai-Ming Liu ◽  
Rong Sun ◽  
Bing-Wu Wang ◽  
Fan Wu ◽  
Xiang Hao ◽  
...  
Keyword(s):  
Single Molecule ◽  
Room Temperature ◽  
Ferromagnetic Coupling ◽  
Single Molecule Magnets ◽  
Faraday Effects

The localized electron: magnetic properties

2018 ◽  
Author(s):  
Jean-Pierre Launay ◽  
Michel Verdaguer
Keyword(s):  
Single Molecule ◽  
Model Systems ◽  
Ferromagnetic Coupling ◽  
Single Chain ◽  
Single Molecule Magnets ◽  
Magnetic Systems ◽  
Orbital Interactions ◽  
Prussian Blue Analogues ◽  
Mononuclear Complexes

After preliminaries about electron properties, and definitions in magnetism, one treats the magnetism of mononuclear complexes, in particular spin cross-over, showing the role of cooperativity and the sensitivity to external perturbations. Orbital interactions and exchange interaction are explained in binuclear model systems, using orbital overlap and orthogonality concepts to explain antiferromagnetic or ferromagnetic coupling. The phenomenologically useful Spin Hamiltonian is defined. The concepts are then applied to extended molecular magnetic systems, leading to molecular magnetic materials of various dimensionalities exhibiting bulk ferro- or ferrimagnetism. An illustration is provided by Prussian Blue analogues. Magnetic anisotropy is introduced. It is shown that in some cases, a slow relaxation of magnetization arises and gives rise to appealing single-ion magnets, single-molecule magnets or single-chain magnets, a route to store information at the molecular level.

Humidity driven molecular switch based on photoluminescent DyIIICoIII single-molecule magnets

2019 ◽  
Vol 7 (14) ◽  
pp. 4164-4172 ◽  
Author(s):  
Szymon Chorazy ◽  
Jakub J. Zakrzewski ◽  
Mateusz Reczyński ◽  
Koji Nakabayashi ◽  
Shin-ichi Ohkoshi ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Room Temperature ◽  
Functional Materials ◽  
Molecular Switch ◽  
Dehydration Process ◽  
Single Molecule Magnets ◽  
Visible Photoluminescence ◽  
Slow Magnetic Relaxation

Functional materials incorporating cyanido-bridged DyIIICoIII molecules combine visible photoluminescence and slow magnetic relaxation, both switchable by the level of humidity within the reversible room temperature dehydration process.

scholarly journals Tuning the magneto-optical response of TbPc2 single molecule magnets by the choice of the substrate

2015 ◽  
Vol 3 (31) ◽  
pp. 8039-8049 ◽  
Author(s):  
Peter Robaschik ◽  
Michael Fronk ◽  
Marius Toader ◽  
Svetlana Klyatskaya ◽  
Fabian Ganss ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Molecule ◽  
Room Temperature ◽  
Optical Response ◽  
Single Molecule Magnets ◽  
Kerr Rotation

Magneto-optical Kerr rotation of thin films of TbPc2 single molecule magnets can be tuned at room temperature within almost two orders of magnitude by the choice of the substrate.

scholarly journals Ferromagnetic Oxime-Based Manganese(III) Single-Molecule Magnets with Dimethylformamide and Pyridine as Terminal Ligands

Crystals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 23 ◽  
Author(s):  
Carlos Rojas-Dotti ◽  
Nicolás Moliner ◽  
Francesc Lloret ◽  
José Martínez-Lillo
Keyword(s):  
Single Molecule ◽  
Crystal Packing ◽  
Building Blocks ◽  
Typical Feature ◽  
Ferromagnetic Coupling ◽  
Single Molecule Magnets ◽  
Monoclinic System ◽  
New Members ◽  
Space Group ◽  
New Magnetic Materials

Two new members of the [Mn6] family of single-molecule magnets (SMMs) of formulae [Mn6(μ3-O)2(H2N-sao)6(dmf)8](ClO4)2 (1) and [Mn6(μ3-O)2(H2N-sao)6(py)6(EtOH)2][ReO4]2·4EtOH (2), (dmf = N,N′-dimethylformamide, py = pyridine, H2N-saoH2 = salicylamidoxime) have been synthesized and characterized structurally and magnetically. Both compounds were straightforwardly prepared from the deprotonation of the H2N-saoH2 ligand in the presence of the desired manganese salt and solvent (dmf (1) vs. py (2)). Compound 1 crystallizes in the triclinic system with space group Pī and 2 crystallizes in the monoclinic system with space group P21/n. In the crystal packing of 1 and 2, the (ClO4)− (1) and [ReO4]− (2) anions sit between the cationic [Mn6]2+ units, which are H-bonded to –NH2 groups from the salicylamidoxime ligands. The study of the magnetic properties of 1 and 2 revealed ferromagnetic coupling between the MnIII metal ions and the occurrence of slow relaxation of the magnetization, which is a typical feature of single-molecule magnet behavior. The cationic nature of these [Mn6]2+ species suggests that they could be used as suitable building blocks for preparing new magnetic materials exhibiting additional functionalities.

Room temperature memory device using single-molecule magnets

RSC Advances ◽  
2015 ◽  
Vol 5 (67) ◽  
pp. 54667-54671 ◽  
Author(s):  
Hua Hao ◽  
XiaoHong Zheng ◽  
Ting Jia ◽  
Zhi Zeng
Keyword(s):  
Charge State ◽  
Single Molecule ◽  
Room Temperature ◽  
State Transition ◽  
Memory Device ◽  
Molecular Memory ◽  
Single Molecule Magnets

Based on charge-state transition, a molecular memory device utilising single-molecule magnets can work at room temperature.

scholarly journals Sensitivity enhancement of graphene Hall sensors modified by single-molecule magnets at room temperature

RSC Advances ◽  
2017 ◽  
Vol 7 (4) ◽  
pp. 1776-1781 ◽  
Author(s):  
Yuanhui Zheng ◽  
Le Huang ◽  
Zhiyong Zhang ◽  
Jianzhuang Jiang ◽  
Kaiyou Wang ◽  
...  
Keyword(s):  
Single Molecule ◽  
Room Temperature ◽  
Sensitivity Enhancement ◽  
Single Molecule Magnets ◽  
Hall Sensors

Sensitivity of graphene Hall sensors was enhanced by modifying single-molecule magnets with excellent linearity, off voltage, repeatability and stability.

scholarly journals Spin state of a single-molecule magnet (SMM) creating long-range ordering on ferromagnetic layers of a magnetic tunnel junction – a Monte Carlo study

RSC Advances ◽  
2021 ◽  
Vol 11 (51) ◽  
pp. 32275-32285
Author(s):  
Andrew Grizzle ◽  
Christopher D'Angelo ◽  
José Martínez-Lillo ◽  
Pawan Tyagi
Keyword(s):  
Single Molecule ◽  
Tunnel Junction ◽  
Room Temperature ◽  
Magnetic Tunnel Junction ◽  
Monte Carlo Study ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Ferromagnetic Electrodes ◽  
Ferromagnetic Layers ◽  
Long Range Ordering

Paramagnetic single-molecule magnets (SMMs) interacting with the ferromagnetic electrodes of a magnetic tunnel junction (MTJ) produce new molecular spintronics testbed and highly ordered magnetic metamaterial promising for room temperature.

Single-Molecule Magnets

MRS Bulletin ◽  
2000 ◽  
Vol 25 (11) ◽  
pp. 66-71 ◽  
Author(s):  
George Christou ◽  
Dante Gatteschi ◽  
David N. Hendrickson ◽  
Roberta Sessoli
Keyword(s):  
Lower Limit ◽  
Single Molecule ◽  
Size Effects ◽  
Room Temperature ◽  
Information Storage ◽  
Quantum Computers ◽  
Quantum Size Effects ◽  
Single Molecule Magnets ◽  
Quantum Size

Magnets are widely used in a large number of applications, and their market is larger than that of semiconductors. Information storage is certainly one of the most important uses of magnets, and the lower limit to the size of the memory elements is provided by the superparamagnetic size, below which information cannot be permanently stored because the magnetization freely fluctuates. This occurs at room temperature for particles in the range of 10–100 nm, owing to the nature of the material. However, even smaller particles can in principle be used either by working at lower temperatures or by taking advantage of the onset of quantum size effects, which can make nanomagnets candidates for the construction of quantum computers.

Seeking Magneto-Structural Correlations in Easily Tailored Pentagonal Bipyramid Dy(III) Single-Ion Magnets

2019 ◽  
Author(s):  
Guo-Zhang Huang ◽  
Ze-Yu Ruan ◽  
Jie-Yu Zheng ◽  
Yan-Cong Chen ◽  
Si-Guo Wu ◽  
...  
Keyword(s):  
Single Molecule ◽  
Structural Engineering ◽  
Magnetic Hysteresis ◽  
Sweep Rate ◽  
Coordination Bond ◽  
Pentagonal Bipyramid ◽  
Single Molecule Magnets ◽  
Crystal Field Theory ◽  
Bond Angles ◽  
Axial Coordination

<p><a></a>Controlling molecular magnetic anisotropy via structural engineering is delicate and fascinating, especially for single-molecule magnets (SMMs). Herein a family of dysprosium single-ion magnets (SIMs) sitting in pentagonal bipyramid geometry have been synthesized with the variable-size terminal ligands and counter anions, through which the subtle coordination geometry of Dy(III) can be finely tuned based on the size effect. The effective energy barrier (Ueff) successfully increases from 439 K to 632 K and the magnetic hysteresis temperature (under a 200 Oe/s sweep rate) raises from 11 K to 24 K. Based on the crystal-field theory, a semi-quantitative magneto-structural correlation deducing experimentally for the first time is revealed that the Ueff is linearly proportional to the structural-related value S2<sup>0</sup> corresponding to the axial coordination bond lengths and the bond angles. Through the evaluation of the remanent magnetization from hysteresis, quantum tunneling of magnetization (QTM) is found to exhibit negative correlation with the structural-related value S<sub>tun</sub> corresponding to the axial coordination bond angles.<br></p>

Correlating Blocking Temperatures in Single Molecule Magnets with Raman Relaxation

2018 ◽  
Author(s):  
Marcus J. Giansiracusa ◽  
Andreas Kostopoulos ◽  
George F. S. Whitehead ◽  
David Collison ◽  
Floriana Tuna ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Single Molecule ◽  
Energy Barrier ◽  
Thermal Relaxation ◽  
Relaxation Mechanism ◽  
Blocking Temperature ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Key Parameter

We report a six coordinate DyIII single-molecule magnet<br>(SMM) with an energy barrier of 1110 K for thermal relaxation of<br>magnetization. The sample shows no retention of magnetization<br>even at 2 K and this led us to find a good correlation between the<br>blocking temperature and the Raman relaxation regime for SMMs.<br>The key parameter is the relaxation time (𝜏<sub>switch</sub>) at the point where<br>the Raman relaxation mechanism becomes more important than<br>Orbach.

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